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  <title>The EvSignal class</title>

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 <h1 class="title">The EvSignal class</h1>
 
 <div class="partintro"><p class="verinfo">(PECL ev &gt;= 0.2.0)</p>

  <div class="section" id="evsignal.intro">
   <h2 class="title">简介</h2>
  <p class="para">
    <strong class="classname">EvSignal</strong>
    watchers will trigger an event when the process receives a specific signal
    one or more times. Even though signals are very asynchronous,
    <em class="emphasis">libev</em>
    will try its best to deliver signals synchronously, i.e. as part of the
    normal event processing, like any other event.
   </p>
   <p class="para">
    There is no limit for the number of watchers for the same signal, but only
    within the same loop, i.e. one can watch for
    <strong><code>SIGINT</code></strong>
    in the default loop and for
    <strong><code>SIGIO</code></strong>
    in another loop, but it is not allowed to watch for
    <strong><code>SIGINT</code></strong>
    in both the default loop and another loop at the same time. At the moment,
    <strong><code>SIGCHLD</code></strong>
    is permanently tied to the default loop.
   </p>
   <p class="para">
    If possible and supported,
    <em class="emphasis">libev</em>
    will install its handlers with
    <em>SA_RESTART</em>
    (or equivalent) behaviour enabled, so system calls should not be unduly
    interrupted. In case of a problem with system calls getting interrupted by
    signals, all the signals can be blocked in an
    <a href="class.evcheck.html" class="classname">EvCheck</a>
    watcher and unblocked in a
    <a href="class.evprepare.html" class="classname">EvPrepare</a>
    watcher.
   </p>
  </div>

  <div class="section" id="evsignal.synopsis">
   <h2 class="title">类摘要</h2>


   <div class="classsynopsis">
    <div class="ooclass">
     
    </div>

    <div class="classsynopsisinfo">
     <span class="ooclass">
      <strong class="classname">EvSignal</strong>
     </span>
     <span class="ooclass">
      <span class="modifier">extends</span>
      <a href="class.evwatcher.html" class="classname">EvWatcher</a>
     </span>
     {</div>

    <div class="classsynopsisinfo classsynopsisinfo_comment">/* 属性 */</div>
    <div class="fieldsynopsis">
     <span class="modifier">public</span>
      <var class="varname"><a href="class.evsignal.html#evsignal.props.signum">$<var class="varname">signum</var></a></var>
    ;</div>

    <div class="classsynopsisinfo classsynopsisinfo_comment">/* 继承的属性 */</div>
    <div class="fieldsynopsis">
     <span class="modifier">public</span>
      <var class="varname"><a href="class.evwatcher.html#evwatcher.props.is-active">$<var class="varname">is_active</var></a></var>
    ;</div>
<div class="fieldsynopsis">
     <span class="modifier">public</span>
      <var class="varname"><a href="class.evwatcher.html#evwatcher.props.data">$<var class="varname">data</var></a></var>
    ;</div>
<div class="fieldsynopsis">
     <span class="modifier">public</span>
      <var class="varname"><a href="class.evwatcher.html#evwatcher.props.is-pending">$<var class="varname">is_pending</var></a></var>
    ;</div>
<div class="fieldsynopsis">
     <span class="modifier">public</span>
      <var class="varname"><a href="class.evwatcher.html#evwatcher.props.priority">$<var class="varname">priority</var></a></var>
    ;</div>

    <div class="classsynopsisinfo classsynopsisinfo_comment">/* 方法 */</div>
    <div class="methodsynopsis dc-description">
   <span class="modifier">public</span>
   <span class="methodname"><a href="evsignal.construct.html" class="methodname">__construct</a></span>
    ( <span class="methodparam">
    <span class="type">int</span>
     <code class="parameter">$signum</code>
   </span>
   , <span class="methodparam">
    <span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span>
     <code class="parameter">$callback</code>
   </span>
   [, <span class="methodparam">
    <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span>
     <code class="parameter">$data</code>
    <span class="initializer"> = <strong><code>NULL</code></strong></span>
   </span>
   [, <span class="methodparam">
    <span class="type">int</span>
     <code class="parameter">$priority</code>
    <span class="initializer"> = 0</span>
   </span>
  ]] )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">final</span>
   <span class="modifier">public</span>
   <span class="modifier">static</span>
   <span class="type">EvSignal</span>
   <span class="methodname"><a href="evsignal.createstopped.html" class="methodname">createStopped</a></span>
    ( <span class="methodparam">
    <span class="type">int</span>
     <code class="parameter">$signum</code>
   </span>
   , <span class="methodparam">
    <span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span>
     <code class="parameter">$callback</code>
   </span>
   [, <span class="methodparam">
    <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span>
     <code class="parameter">$data</code>
    <span class="initializer"> = <strong><code>NULL</code></strong></span>
   </span>
   [, <span class="methodparam">
    <span class="type">int</span>
     <code class="parameter">$priority</code>
    <span class="initializer"> = 0</span>
   </span>
  ]] )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span>
   <span class="type">void</span>
   <span class="methodname"><a href="evsignal.set.html" class="methodname">set</a></span>
    ( <span class="methodparam">
    <span class="type">int</span>
     <code class="parameter">$signum</code>
   </span>
   )</div>

    <div class="classsynopsisinfo classsynopsisinfo_comment">/* 继承的方法 */</div>
    <div class="methodsynopsis dc-description">
   <span class="modifier">public</span>
   <span class="type">int</span>
   <span class="methodname"><a href="evwatcher.clear.html" class="methodname">EvWatcher::clear</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">abstract</span>
   <span class="modifier">public</span>
   <span class="methodname"><a href="evwatcher.construct.html" class="methodname">EvWatcher::__construct</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span>
   <span class="type">void</span>
   <span class="methodname"><a href="evwatcher.feed.html" class="methodname">EvWatcher::feed</a></span>
    ( <span class="methodparam">
    <span class="type">int</span>
     <code class="parameter">$revents</code>
   </span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span>
   <span class="type">EvLoop</span>
   <span class="methodname"><a href="evwatcher.getloop.html" class="methodname">EvWatcher::getLoop</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span>
   <span class="type">void</span>
   <span class="methodname"><a href="evwatcher.invoke.html" class="methodname">EvWatcher::invoke</a></span>
    ( <span class="methodparam">
    <span class="type">int</span>
     <code class="parameter">$revents</code>
   </span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span>
   <span class="type">bool</span>
   <span class="methodname"><a href="evwatcher.keepalive.html" class="methodname">EvWatcher::keepalive</a></span>
    ([ <span class="methodparam">
    <span class="type">bool</span>
     <code class="parameter">$value</code>
   </span>
  ] )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span>
   <span class="type">void</span>
   <span class="methodname"><a href="evwatcher.setcallback.html" class="methodname">EvWatcher::setCallback</a></span>
    ( <span class="methodparam">
    <span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span>
     <code class="parameter">$callback</code>
   </span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span>
   <span class="type">void</span>
   <span class="methodname"><a href="evwatcher.start.html" class="methodname">EvWatcher::start</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span>
   <span class="type">void</span>
   <span class="methodname"><a href="evwatcher.stop.html" class="methodname">EvWatcher::stop</a></span>
    ( <span class="methodparam">void</span>
   )</div>

   }</div>

  </div>

  <div class="section" id="evsignal.props">
   <h2 class="title">属性</h2>
   <dl>

    
     <dt id="evsignal.props.signum">
      <var class="varname"><var class="varname">signum</var></var>
     </dt>

     <dd>

      <p class="para">
       Signal number. See the constants exported by
       <em class="emphasis">pcntl</em>
       extension. See also
       <em>signal(7)</em>
       man page.
      </p>
     </dd>

    
   </dl>

  </div>

 </div>

 
















<h2>Table of Contents</h2><ul class="chunklist chunklist_reference"><li><a href="evsignal.construct.html">EvSignal::__construct</a> — Constructs EvPeriodic watcher object</li><li><a href="evsignal.createstopped.html">EvSignal::createStopped</a> — Create stopped EvSignal watcher object</li><li><a href="evsignal.set.html">EvSignal::set</a> — Configures the watcher</li></ul>
</div>
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